Spray hend
Nozzle head
Orifice Plate
Nozzle Body
? The AT-Temp is a desuperheater which will not control the flow by throttling the water pressure; but by opening and closing flow area
? Therefore this type of desuperheater (attemperator) is named “Variable Area Desuperheater” or “Multiple Nozzle Desuperheater”
? The control of opening is by a piston which slides in a cylinder
? By uncovering more feed holes to the nozzles, the available flow area will increase and more water will be injected at CONSTANT ?P
Spraying Example of TAIR Desuperheater
The spray cylinder gives the AT-Temp its
flow (Cv) vs travel characteristic
Several Rows of Fine Spraying Nozzles
Spray Cylinders are selected based on the application conditions
Spray Cylinders are designated by the nozzle size and number > “six” size nozzles design
Spray cylinders are easy to change in the field with new or changing process conditions
Sharp angles inside and at top of nozzlehead are round off to avoid possible cracks.
Each nozzle is torque, and then vacuum brazed in place. They are permanent, and never come out.
Spray Cylinder with removed nozzles to show the over-lapping feeder hole pattern
Water exits the nozzle as a fine hollow cone spray pattern
Consists of a nozzle body and a nozzle orifice
Water enters the nozzle body tangentially
The water is spun and accelerated in the nozzle orifice